US2657046A - Automatic feed mechanism for power presses and like machines - Google Patents

Automatic feed mechanism for power presses and like machines Download PDF

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Publication number
US2657046A
US2657046A US242763A US24276351A US2657046A US 2657046 A US2657046 A US 2657046A US 242763 A US242763 A US 242763A US 24276351 A US24276351 A US 24276351A US 2657046 A US2657046 A US 2657046A
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United States
Prior art keywords
oil
movement
piston
impeller
strip
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US242763A
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English (en)
Inventor
Tallis Charles Edward
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Birmingham Tool & Gauge Compan
BIRMINGHAM TOOL and GAUGE Co Ltd
Original Assignee
Birmingham Tool & Gauge Compan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Birmingham Tool & Gauge Compan filed Critical Birmingham Tool & Gauge Compan
Priority to US340804A priority Critical patent/US2669185A/en
Application granted granted Critical
Publication of US2657046A publication Critical patent/US2657046A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material

Definitions

  • This invention comprises improvements 'in or relating to automatic ⁇ feed mechanism for power presses and like machines.
  • the object of the present invention is ⁇ to provide a hydraulically operated feed mechanism, wherein the pitch of the feed can be readily adjusted whilst the press or like machine is in operation.
  • a further object of this invention is to provide means whereby the extent of intermittent feed movement of the strip or like stockbeing fed can be infinitely varied between limits.
  • Figure 1 is a plan view of strip feeding means according to this invention.
  • Figure 2 is a sectional elevation taken on the line 2 2 of Figure 1 as regards the upper part of the elevation, the lower part corresponding to a section taken on theline 2 2 of Figule.
  • Figure 3 is a cross sectional view taken on the line 3 3 of Figure 1 or Figure 2.
  • Figure 4 is a cross sectional view taken on the line 4 4 of Figure 1.
  • Figures 5, 6 and '7 ⁇ are detail cross sectional plan views taken on the lines 5, 6 6 and 'I 'I re- ⁇ spectively, of Figure ⁇ 2.
  • Figures 8 and 9 aredetail cross sectional views taken on the lines 8 8 and 9 9 respectively of Figure 2.
  • Figure 10 is a cross sectional elevation of the pump or impeller.
  • Figure 11 is a view taken on the line II II of Figure 10, i. e. an end view of the impeller with the cover removed.
  • Figure 12 is a viewof the other end of the impeller.
  • Figure 13 is a detail sectional view on an enlarged scale of one ⁇ of the impeller plungers showing the automaticreplenishing valve mechanism therein.
  • the base II of the machine houses a block assembly I containing valve controlled ducts on ⁇ which is mounted a support member 2 for two hydraulic rams in the form of two parallel cylinders 3, 4 containing pistons 5, E respectively, arranged to operate in opposite directions (see Figure l) on a suitable table I carried by a saddle 8 which slides, on the cylinders 3, ⁇ II so that the latter form ⁇ guides for slidably supporting, the table .'I. l
  • gripper unit 9 Carried at one end, of the table, 1 a. gripper unit 9, whilst a similar fixed gripper unit I0 ex,- tends across the table and is mounted on the base II. Both these gripper units have hinged covers I2 ⁇ acting as a normally xed pressure pad and arranged to open bookwise in the body part of the gripper unit to enable the strip (indicated by the chain dotted line I3) to be placed on pads I4 within each unit, a rubber diaphragm I5 being placed underneath each pad I 4 so that on hydraulic uid such as a suitable oil being fed under the diaphragm I5 the pad I4 is urged towards thecover I2 to grip the strip
  • the cylinders 3, 4 are connected through the valve block I by means of pipes I6, I' to an impeller ( Figure 10) for forcing and withdrawing oil alternately from said cylinders 3, 4.
  • an impeller Figure 10 for forcing and withdrawing oil alternately from said cylinders 3, 4.
  • the oil line connected by the pipe Il passes directly through the block I to the forward cylinder 3, but the other oil line is led to the return cylinder 4 through the pipe I5 via a series of valve controlled ducts in the block I whereby the reciprocating motion of the table I is controlled in relationto the opening and closing of the gripper units S, IB which are operated by a separate hydraulic system comprising mainly the operating piston I8 and a small reservoir I9 (see Figure 2).
  • the arrangement is such that just prior to the commencement of a forward movement of the table the. gripper unit 9' grips the strip I3, Whilst the unit I0 releases its grip thereon enabling the strip to be fed forward by forward movement of the table "l. Upon the table reaching its extreme forward position it pauses for an instant suncient for the gripping'unit 9 to release its grip on the strip I3, whilst at the same time the gripper unit lil grips the strip and holds it while the table effects a return movement with the released gripper unit 9, it will thus be seen that by repeated reciprocatory cycles of the table l the strip is fed forward intermittently for the purposes of having a stamping, pressing or like operation performed thereon by a machine on which feeding means according to this invention is installed.
  • the impeller ( Figures 10 to 12) is arranged to have an infinitely variable stroke which is adjusted by means of the control knob 25 so that the extent of travel of the table i per cycle can be adjusted within limits to enable a feed of the strip I3 to be readily set in accordance with requirements and so enable the most economical use of the strip to be effected especially in stamping or pressing operations.
  • two table units are preferably employed one each side of the press table or the like and operated in unison by a common impeller so that one table unit feeds the strip onto the press tabie whilst the other pulls the scrap strip oif it, thus avoiding strip flexure or buckling which may be further avoided by arranging the table unit pulling the scrap strip to put a slight tension on the strip.
  • each table unit may have a rearward extension constantly and slidably engaging a forward extension on the fixed gripper unit.
  • oil movement takes place from the impeller (Figure lo) via the pipe I7, and vertical ducts 2l ( Figure 4) and 22 in the block I and cylinder support 2 respectively, to the forward cylinder 3.
  • the oil movement first takes place along a horizontal duct 23 ( Figure 6) communicating the vertical duct 2l to one end of a small piston 24 to move the latter to the right.
  • valve member 3S When oil is displaced into the horizontal duct 25 it can only move in the direction above mentioned by reason of the fact that movement in the opposite direction i. e. to the left in Figure 6 is checked by the valve member 3S ( Figure 2) until a predetermined oil pressure is reached, since the left hand end of the horizontal duct 25 communicates with the vertical duct 3S ( Figure 9) which in turn communicates with the annular space 3S around the valve member 39 by means of the short horizontal duct 3i.
  • the valve member 39 is provided with a locally reduced part iii ( Figure 2) which allows passage of oil into the horizontal duct il when a predetermined oil pressure is reached sumcient to move the valve member 3S against its spring 5I, the loading of which is set by the screw means 52.
  • the vertical duct 33 ( Figure 9) communicates with a horizontal duct 50 to enter the annular space 49 around the valve member but thisrvalve cannot be lifted in the manner of the valve member 39, and furthermore, a fiat 43 ( Figure 2) on this valve member permits passage of oil to the rear thereof, so that whatever the pressure of the oil supplied to the annular space di] the valve member :i5 is held on its seat by the oil passing to the rear of the valve member by the said iiat 43.
  • the reservoir i9 communicates with the said bore 53 by means of a small vertical duct 5d ( Figure 5) to an annular groove 55 in said bore.
  • valve member 39 is provided with a locally reduced part di?
  • the extent of oil movement the extent of feeding Amovement of the'table 1 can be varied and so adjusted to suit requirements.
  • the impeller is so arranged and ⁇ constructed to enable a variable oil movement to ⁇ be obtained.
  • the-impeller comprises two pairs of plungers 68, -66 and 6I, 6I operating in1bushes62 in the wall ⁇ 63 of the impeller housing, ⁇ the-pair of plungers 160, 86 which operate together enter a chamber 64 communicating with the pipe I6, whilst in a similar manner the pair of plungers 6I, 6I enter a chamber65 communicating with the pipe I1, the ends of the plungers remote from said lc :harnber are each provided ⁇ withnrollers 66 for ⁇ pivoted to :support members Aor ,blocks 69, 10.
  • pivoted members 161, 68 each :carry l-;uni versally pivoted thereon shoes 1I bearing :against the face of a swash plateor face cam A12 crotatably mounted inthe cover 1-3 of ythe impeller housing and driven in any suitable manner 1in timed relationship with the machine.
  • the blocks 69, ⁇ 1I) have a screw .threaded engagement with the threaded portions 14, ,15 ofthe vertical shaft 16 rotatably mounted in the impeller housing and having secured to its lupper end the aforesaid control knob 20.
  • Thethreaded portions 14, 15 of this shaft are of opposite :hand so that on rotation of the shaft the blocks69, 10 are either moved apart or towards one another.
  • the shoes ⁇ 1I are either moved towards the centre ofthe lface ⁇ cam 12 to reduce the stroke of the plungers ⁇ 68.
  • the ends of the plngers 60, 6 8, 6I, 64I within the chambers 64, 65 respectively are bored at '1;1 ( Figure 13) to receive compression springs 18for abutment therein, the outer ⁇ ends of thesprings 18 abutting the wall 63 of the impeller housing in order to maintain the rollers 66 at theother ends of pistons in contact with ⁇ the pivoted members 61, 68.
  • the housing of the pump containing (the swash plate 12 and associated mechanism servesas f a reservoir for oil at atmospheric pressure for gthe purpose of replenishing the two lines of oilunder pressure between the impeller and the cylinders 3, 4 in order to make good any loss.
  • communication is eiectel between the housing of the pump and the chambers 6,4, 65 ,bv means of automatic valves contained in --at least one plunger 60 or 6I of each pair.
  • valve member 85 Located in the bore 82 for limited sliding movement between the inner end of the shankBI and the annular shoulder 84 in the plunger 60 is 'a valve member 85 the full diameter ⁇ portion 860i which is an oil tight sliding iit in the 4bore 82 and when in the-position shown closes the inner end of the bore 83 in the shank 8l from the bore-11 and hence from communication with the charnber 64, the valve member 85 being urged to this position by pressure of oil thereon frornsaid chamber.
  • Automatic feed mechanism for power presses and like machines comprising in combination a base; a table mounted for reciprocatory movement on said base; hydraulically operated grip- 'ping means adapted to grip stock and mounted on said table for movement therewith; fixed hydraulically operated gripping means adapted to grip stock and mounted on said base so as to extend over the table in alignment with the movable gripping means on the latter; a pair of hydraulic rams mounted on said base and arranged to act in opposite directions on the table for imparting reciprocatory motion to the latter; a hydraulic impeller; a hydraulic system including two hydraulic fluid lines operatively connecting the impeller with the hydraulic rams.
  • a further hydraulic system comprising a piston arranged for operation by hydraulic fluid from at least one of the two :duid lines of the first mentioned hydraulic system Which piston is adapted to displace fluid to one of the gripping means and withdraw fluid from the other and vice versa -in order to alternately open and close the gripping means in timed relationship with the reciprocation of the table for effecting the automatic intermittent feed of stock to a machine; and a further piston arranged to be also operated on by uid from the two hydraulic fluid lines of the first mentioned hydraulic system and in conjunction with the said piston of the hydraulic system for operating the gripping means, adapted to introduce 'lost-motion into the fluid movement alongthe two hydraulic fluid lines for the purposes of .causing the table to pause at each extreme of its reciprocatory movement in order to enable the gripping action of the gripping means to be changed Whilst the table is stationary.
  • Automatic feed mechanism for power presses and like machines comprising in combination a base; a table mounted for reciprocatory movement on said base; hydraulically operated gripping means adapted to grip stock and mounted on said table for movement therewith; fixed hydraulically operated gripping means adapted to grip fixed stock and mounted on said base so as to extend over the table in alignment with the movable gripping means on the latter; a pair of hydraulic rams mounted on said base and arranged to act in opposite directions on the table for imparting reciprocatory motion to the latter, cylinders of said rams forming guides on which the table can slide for reciprocatory movement; a variable stroke hydraulic impeller; a hydraulic system including two hydraulic fluid lines operatively connecting the impeller with the hydraulic rams for reciprocation of the table; a block assembly in said base having uidways therein for connecting said uid lines to the rams; a further hydraulic system comprising a piston slidable in a bore in said block assembly, said piston being arranged for operation by hydraulic fluid from one of said fluid lines through said fluidways
  • a step by step feeding device for feeding sheet material with a step by step motion, said device comprising a stationary material support, a reciprocable material support, a primary pressure uid instrumentality including a pressure uid pump for reciprocating said reciprocable support, and a pressure fluid actuated clamp mounted on each support, one of said clamps being reciprocable with said reciprocable support, in combination with a secondary self-contained sealed unit pressure iiuid instrumentality including a free action type reciprocating piston, a cylinder in which said piston reciprocates, conduit means connecting said clamps with said cylinder on opposite sides of said piston, and an axial rod medially of which said piston is rigidly mounted, the respective ends of said rod being of reduced diameter with respect to the corresponding operative face of said piston and being successively subjected to the pressure of the uid of said primary pressure liuid instrumentality to alternately move said piston in opposite directions to alternately supply uid under pressure to, and Withdraw fluid from, said clamps at the end of each step by step movement
  • a step by step feeding device for feeding sheet material with a step by step motion, said device comprising a stationary material support, a reciprocable material support, a primary pressure fluid instrumentality for reciprocating said reciprocable support, and a pressure fluid actuated clamp mounted on each support, one of said clamps being reciprocable with said reciprocable support, in combination with a secondary selfcontained sealed unit pressure uid instrumentality including a reciprocating piston, a cylinder in which said piston reciprocates, conduit means connecting said clamps with said cylinder on opposite sides of said piston, and an axial rod media-ily of which said piston is rigidly mounted, the respective ends of said rod being of reduced diameter with relation to the corresponding operative faces of said piston and being successively subjected to the pressure of the fluid of the primary pressure iluid instrumentality to alternately move said piston in opposite directions to alternately supply uid under pressure to, and withdraw fluid from, said clamps.
  • a step by .step feeding device for feeding sheet material with a step by step motion, said device comprising a stationary material support, a reciprocable material support, a primary pressure iluid instrumentality for reciprocating said reciprocable support, and a pressure fluid actuated clarnp mounted on each support, one of said clamps being reciprocable with said reciprocable support, in combination with a secondary pressure fluid instrumentality including a double acting secondary system pump and conduit means connecting said clamps With said pump, said pump having portions successively subjected to the pressure of the fluid of said primary pressure duid instrumentality to operate said pump to alternately supply fluid under pressure to, and withdraw fluid from, said clamps at the end of each step by step movement of said reciprocable support and before the initiation of the succeeding step by step movement thereof, whereby the reciprocable support will remain at a standstill while the fluid is being forced to one clamp and simultaneously is being withdrawn from the other clamp.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Advancing Webs (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
US242763A 1950-08-29 1951-08-20 Automatic feed mechanism for power presses and like machines Expired - Lifetime US2657046A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US340804A US2669185A (en) 1951-08-20 1953-03-06 Hydraulic impeller or pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21271/50A GB703259A (en) 1950-08-29 1950-08-29 Improvements in or relating to automatic feed mechanism for power presses and like machines

Publications (1)

Publication Number Publication Date
US2657046A true US2657046A (en) 1953-10-27

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US242763A Expired - Lifetime US2657046A (en) 1950-08-29 1951-08-20 Automatic feed mechanism for power presses and like machines

Country Status (6)

Country Link
US (1) US2657046A (de)
BE (1) BE505511A (de)
CH (1) CH295758A (de)
DE (1) DE866188C (de)
FR (1) FR1048443A (de)
GB (1) GB703259A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038646A (en) * 1961-03-21 1962-06-12 U S Tool Company Inc Slide feed
US3051140A (en) * 1959-11-13 1962-08-28 Ferranti Ltd Servo-controlled drives
US3082743A (en) * 1959-08-17 1963-03-26 Honeywell Regulator Co Control apparatus
US3123270A (en) * 1964-03-03 figures
US3125270A (en) * 1964-03-17 Press feed mechanism
US3140032A (en) * 1962-06-05 1964-07-07 Power Control Products Inc Pneumatic stock feed arrangement
US3347434A (en) * 1965-07-13 1967-10-17 Robert G Bodtke Guidance system for a bar feed machine
US5125550A (en) * 1990-06-25 1992-06-30 Scribner Albert W Pneumatically operated feeder for strip stock

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2851475A1 (de) * 1978-11-28 1980-06-04 Heinz Finzer Kg Maschinenfabri Vorschubeinrichtung fuer den materialeinzug an metallbearbeitungsmaschinen
CN116175250B (zh) * 2023-04-24 2023-06-20 北京市劳保所科技发展有限责任公司 一种机床自动上下料机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1257507A (en) * 1915-11-24 1918-02-26 Wm Steiner Sons & Co Automatic feeding device for band-cutting machines.
US1297341A (en) * 1916-02-07 1919-03-18 Simmons Co Rolling and punching mechanism.
US2228245A (en) * 1939-12-30 1941-01-14 Western Electric Co Work feeding apparatus
US2344565A (en) * 1941-06-30 1944-03-21 Wallace J Scott Fuel injector for diesel engines and the like
US2467740A (en) * 1947-03-15 1949-04-19 Haller John Step-by-step feeding device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1257507A (en) * 1915-11-24 1918-02-26 Wm Steiner Sons & Co Automatic feeding device for band-cutting machines.
US1297341A (en) * 1916-02-07 1919-03-18 Simmons Co Rolling and punching mechanism.
US2228245A (en) * 1939-12-30 1941-01-14 Western Electric Co Work feeding apparatus
US2344565A (en) * 1941-06-30 1944-03-21 Wallace J Scott Fuel injector for diesel engines and the like
US2467740A (en) * 1947-03-15 1949-04-19 Haller John Step-by-step feeding device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123270A (en) * 1964-03-03 figures
US3125270A (en) * 1964-03-17 Press feed mechanism
US3082743A (en) * 1959-08-17 1963-03-26 Honeywell Regulator Co Control apparatus
US3051140A (en) * 1959-11-13 1962-08-28 Ferranti Ltd Servo-controlled drives
US3038646A (en) * 1961-03-21 1962-06-12 U S Tool Company Inc Slide feed
US3140032A (en) * 1962-06-05 1964-07-07 Power Control Products Inc Pneumatic stock feed arrangement
US3347434A (en) * 1965-07-13 1967-10-17 Robert G Bodtke Guidance system for a bar feed machine
US5125550A (en) * 1990-06-25 1992-06-30 Scribner Albert W Pneumatically operated feeder for strip stock

Also Published As

Publication number Publication date
FR1048443A (fr) 1953-12-22
DE866188C (de) 1953-02-09
GB703259A (en) 1954-02-03
CH295758A (de) 1954-03-16
BE505511A (de)

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